Table
| Extension | 0..* | |
| Extension.id | string | 0..1 |
| Extension.extension | Extension | 0..* |
| Extension.url | uri | 1..1 |
| Extension.value[x]:valueQuantity | Quantity | 0..1 |
| Extension.value[x]:valueQuantity.id | string | 0..1 |
| Extension.value[x]:valueQuantity.extension | Extension | 0..* |
| Extension.value[x]:valueQuantity.value | decimal | 0..1 |
| Extension.value[x]:valueQuantity.comparator | code | 0..0 |
| Extension.value[x]:valueQuantity.unit | string | 0..1 |
| Extension.value[x]:valueQuantity.system | uri | 0..1 |
| Extension.value[x]:valueQuantity.code | code | 0..1 |